DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR 1.4V Maximum Dro
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AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
1.4V Maximum Dropout Full Load Current Built-in Thermal Shutdown Output Current Limiting Adjustable Output Voltage Fixed 1.5V, 1.8V, 2.5V, 3.3V, 5.0V Fast Transient Response Good Noise Rejection Lead Free Packages: TO252-3L, TO263-3L TO220-3L TO252-3L, TO263-3L TO220-3L: Available "Green" Molding Compound Lead Free Finish/RoHS Compliant (Note
General Description
AP1084 dropout positive adjustable fixed-mode regulator with 5.0A output current capability. product specifically designed provide well-regulated supply voltage applications such high-speed termination current 3.3V logic supply. AP1084 also well suited other applications such cards. AP1084 guaranteed have lower than 1.4V dropout full load current making ideal provide well-regulated outputs 1.25 3.3V with input supply.
Typical Application Circuit
5.0V 3.3V Fixed Mode Regulator
100uF Vout Vout 3.3V/5A 100uF Vout Vout 100uF 2.5V/5A
Adjustable Regulator
100uF
Note: VREF
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Ordering Information
AP1084
Package TO252-3L TO263-3L TO220-3L Vout Blank 1.5V 1.8V 2.5V 3.3V 5.0V
Packaging (Note TO252-3L TO252-3L TO252-3L TO252-3L TO263-3L TO263-3L TO263-3L TO263-3L TO220-3L TO220-3L
Lead Free Lead Free Green
Packing Tube Tape Reel
Device
Lead-free
Package Code
Lead-free
Lead-free
Lead-free
Lead-free
AP1084DXXL-U AP1084DXXL-13 AP1084DXXG-U AP1084DXXG-13 AP1084KXXL-U AP1084KXXL-13 AP1084KXXG-U AP1084KXXG-13 AP1084TXXL-U AP1084TXXG-U
Notes:
Tube/Bulk Part Number Quantity Suffix
Tape Reel Part Number Quantity Suffix 2500/Tape Reel 2500/Tape Reel 800/Tape Reel 800/Tape Reel
Directive 2002/95/EC (RoHS). applicable RoHS exemptions applied. Please visit website layout shown Diodes Inc. suggested layout document AP02001, which found website
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Assignment
TO252-3L TO263-3L
View
VOUT
TO220-3L
View
VOUT (GND)
VOUT (GND)
VOUT
View)
VOUT VOUT (GND)
Description
Name (GND) Description Adjustable (Ground only fixed mode) resistor divider from this VOUT ground sets output voltage (Ground only Fixed-Mode). output regulator. minimum 10uF (0.15 capacitor must connected from this ground insure stability. input regulator. Typically large storage capacitor connected from this ground insure that input voltage does below minimum dropout voltage during load transient response. This must always 1.4V (1.3V) higher than VOUT order device regulate properly.
VOUT
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Block Diagram
Vout
CURRENT LIMIT Thermal Shutdown 1.25V
Absolute Maximum Ratings
Symbol Parameter Supply Voltage Storage Temperature Maximum Junction Temperature Rating -0.3 +150 Unit
Recommended Operating Conditions
Symbol Parameter Operating Junction Temperature Range Unit
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Electrical Characteristics
Symbol Parameter
(Under Operating Conditions)
Conditions 10mA, (VIN-VOUT) 1.5V 10mA, VOUT+1.5V<VIN<12V, IOUT 10mA, 25oC, 3VVIN12V IOUT 10mA, 25oC, 3.3VVIN12V IOUT 10mA, 25oC, 4VVIN12V IOUT 10mA, 25oC, 4.8VVIN12V IOUT 10mA, 25oC, 6.5VVIN12V 3.3V, 0mA<Io<5A, 0mA<Io<5A, (Note 3.3V, 0mA<Io<5A (Note (Note 25oC (Note 25oC (Note
1.225 1.470 1.764 2.450 3.235 4.900
Typ. 1.250 1.500 1.800 2.500 3.300 5.000
1.275 1.530 1.836 2.550 3.365 5.100
Unit
Reference VREF Voltage AP1084-XXX AP1084-1.5 AP1084-1.8 Line Regulation AP1084-2.5 AP1084-3.3 AP1084-5.0 AP1084-Adj AP1084-1.5 Load Regulation AP1084-1.8 AP1084-2.5 AP1084-3.3 AP1084-5.0
Dropout 5.0A (VOUT VOUT) Voltage Current Limit VIN-VOUT Minimum Load Current Temperature 10mA Stability Thermal Shutdown Temperature Thermal TO220-3L Resistance TO252-3L Junction-toAmbient TO263-3L (Note TO220-3L:Control Circuitry/Power Transistor Thermal Resistance TO252-3L:Control Circuitry/Power Transistor Junction-toCase (Note TO263-3L:Control Circuitry/Power Transistor
Notes:
thermal regulation specifications changes output voltage heating effects. Line load regulation measured constant junction temperature duty cycle pulse testing. Load regulation measured output lead 1/18" from package. Line load regulation guaranteed maximum power dissipation 15W. Power dissipation determined difference between input output output current. Guaranteed maximum power dissipation will available over full input/output range. Test conditions TO220-3L, TO252-3L TO263-3L: Devices mounted FR-4 substrate, single sided board, copper, with minimum recommended layout, flow. case point located thermal tab.
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Functional Description
Introduction AP1084 adjustable Dropout (LDO) regulator terminal device that easily programmed with addition external resistors voltages within range 1.25V Vin-1.4V. AP1084 only needs 1.4V differential between VOUT maintain output regulation. addition, output voltage tolerances also extremely tight they include transient response part specification. example, Intel specification calls total 100mV including initial tolerance, load regulation 5.0A load step. AP1084 specifically designed meet fast current transient needs well providing accurate initial voltage, reducing overall system cost with need fewer output capacitors. Output Voltage Setting AP1084 programmed voltages range 1.25V Vin-1.4V with addition external resistors according following formula:
Vout Vref R2/R1) +Iadj where Vref 1.25 typically, Iadj 55uA typically shown below: AP1084 Vout Vref
Iadj 55uA
AP1084 keeps constant 1.25V between output adjust pin. placing resistor across these pins constant current flows through adding Iadj current into resistor producing voltage equal (1.25/R1)*R2+Iadj*R2 which will added 1.25V output voltage. This summarized above equation. Since minimum load current requirement AP1084 10mA, typically selected resistor that automatically satisfies minimum current requirement. Notice that since Iadj typically range 55uA only adds small error output voltage should only considered when very precise output voltage setting required. example, typical 3.3V application where R1=121 R2=200 error Iadj only 0.3% nominal point. Load Regulation Since AP1084 only terminal device, possible provide true remote sensing output voltage load. best load regulation achieved when bottom side connected load top-side resistor connected directly case VOUT regulator load. important note that high current applications, this re-present significant percentage overall load regulation must keep path from regulator load short possible minimize this effect. Stability AP1084 requires output capacitor part frequency compensation order make regulator stable. most applications minimum 10uF aluminum electrolytic capacitor insures both stability good transient response. Thermal Design AP1084 incorporates internal thermal shutdown that protects device when junction temperature exceeds maximum allowable junction temperature. Although this device operate with junction temperatures range recommended that selected heat sink chosen such that during maximum continuous load operation junction temperature kept below that temperature. Layout Consideration output capacitors must located close VOUT terminal device possible. recommended section layer board plane connect VOUT output capacitors prevent high frequency oscillation that result excessive trace inductance.
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Typical Performance Characteristics
0.20
Output Voltage Deviation
load=1.5A
Dropout Voltage
-0.20
-0.40
-0.80
Dropout Voltage Output Current
Output Current
Load Regulation Temperature
Temperature (oC)
Output Voltage Change
-0.5 -1.5
Output Voltage Deviation
Percent Change Output Voltage Temperature
Output Voltage Deviation (mV) Input Voltage Load Current Output Voltage Deviation (mV) Cin=1uF Cout=10uF Tantalum
Temperature (oC)
Line Regulation
Cin=1uF Cout=10uF Tantalum Preload=100mA
Input Voltage
Line Transient Response
TIME (us)
Load Transient Response
TIME (us)
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Marking Information
TO252-3L
view
Logo
Part Number 1084 84-VV 1.5V 1.8V 2.5V 3.3V 5.0V
84-VV
Lead Free Green Year 01~09 Week 01~52, represents week Internal Code
TO263-3L
view
Logo Part Number 1.5V 1.8V 2.5V 3.3V 5.0V Blank Lead Free Green Year 01~09 Week 01~52, represents Internal code
1084-VV
week
TO220-3L
view
Logo Part Number 1.5V 1.8V 2.5V 3.3V 5.0V Blank
1084-VV
Lead Free Green Year 01~09 Week 01~52, represents Internal code
week
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Package Information
Package type: TO252-3L
(All Dimensions
0.88/1.27
6.354/6.80 6.58 5.20/5.50 5.35
5.40/6.20 5.57
11.0
2.25
9.00/10.40 9.70 2.18/2.40 2.29 NOTE2 SEATING PLANE 0.45/0.58 0.52
10.9 2.54 1.14/1.40 1.27 4.06/4.83 4.45 15.7
0.61
2.28 BSC. 4.57 BSC.
0.64/1.02 0.83
Land Pattern Recommendation (Unit:
0.89/ 1.14
0.45/0.58 0.52
0.51
Package type: TO263-3L
2.92 1.30 14.61/15.88 15.24 8.65/9.65 9.15
9.65/10.29 9.97
2.54 BSC.
1.27/ 1.78 1.52
0.51/0.99 0.75 4/1.4 yp1.27
Land attern ecom endation nit:
0.38
.28/2.8
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
Package Information
Package type: TO220-3L
2.54/3.43 2.98
(Continued)
9.70/10.70 10.20
3.53/4.09 3.81 5.84/6.86 6.35
3.55/4.85 4.20
0.51/1.40 0.95 SEATING PLANE
14.20/16.50 15.35
3.66/6.35 5.00
1.14/1.78 1.46
4.83/5.33 5.08
0.31/1.14 0.51/1.14 0.72 0.83 2.99/2.79 2.54
12.72/14.72 13.72
2.03/2.92 2.48
AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
AP1084
DROPOUT POSITIVE ADJUSTABLE FIXED-MODE REGULATOR
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AP1084 Rev. DS31070
www.diodes.com
JUNE 2009
Diodes Incorporated
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